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missing power

  1. not as much power after topend/exhaust upgrades

    Hi there - thought id fire some questions.. Bought a 77 camaro 350/TH350 8-in-1 exhaust. Drove well, had a torker sp2 and eddie 1406. I got about 19mpg highway without OD cruising. I put on 2 1/4 duals (no x over), vortec heads, lunati cam, popped in a otherwise stock 89 200-4r with stock...